Files with 994 extension are used by the Symantec LiveUpdate. They include some sort of data used for internal purposes.
994 file extension - Symantec LiveUpdate application data file
What is 994 file? How to open 994 files?
The 994 file extension is associated with the Symantec LiveUpdate the Symantec technology that permits an installed Symantec product to connect to a Symantec server over the Internet to check for program and other updates such as virus definitions and URL lists.
The .994 file stores various data used for internal purposes of the Symantec LiveUpdate.